Okay folks.I'm a diy guy. I have been learning from a very knowledgable builder. He says its a waste of time to do my project and this is your turn to weigh in. I am aware you can put in a383 crank in a305. I however want to go further. As you all are aware the 305 is the baby brother of the 350 and the 350 can take more then the 3.75" stroker crank. That crank is the essential combined with the.030"overbore of the cylinders on the 350 to create a383. That same crank in a305 will create a335. But... I believe that the 4"crank will fit the 305 with mod and create a much larger stroker mouse.what do you think?_________________the do it yourself redneck.

I've talked to my uncle about sbc he runs 415-421-434. which is 3.875 stroke and 4" stroke the 434 dynos within 20 horse but the life on that engine is not very long if he ran it every week i wouldnt last half a season. he runs IMCA Modified for last 15 years. then again he's running 8500-9500 on 3/8 mile track so big difference. also read reviews from skip white he dont like to build 434 engines but he will he just warns you the engine life isnt near as long. in my theory i want to try to build the opposite 4.155 bore with 3" crank and boost. i think it would do some crazy stuff. 325 Cid be really snappy and good higher rpm horse. i've only seen one engine simular guy build a 289cid 3" crank sbc and his rev limiter was @ 12K sounds insane.

As stated the 4.00 stroke crank will fit in the small 305 block with custom pistons and a lot of grinding (don't forget the longer the stroker the faster it builds compression so with 305 heads you will need very deep dish pistons to burn pump gas).

Why every one is discouraging your effort is all about the bore. If you want horsepower you go for the largest bore you can buy. Ever wonder how they get 1,000 horsepower out of a three liter normally aspirated engine? Simple the bore is exactly twice the size of the stroke. With a V-12 three liter engine spinning 15,000 RPM it will output 980 to 1,000 horse power for more than 24 hours at a time.

The original James Watt version of the steam engine (he converted it from a vacuum engine to a pressurized engine) swaped a bore you could play hand ball inside the cylinder to only 18 inches but doubled the horsepower out put. It had a walking beam or a crankshaft measured in yards not inches because it was a low RPM engine. As steam trains got faster the bore grew in size (figuring total surface area or pistons) but the stroke got shorter. It was a steam engine that early car makers copied to produce the first successful internal combustion engines.

GM designed the 305 not for power but economy. They needed a V-8 that could raise their CAFE numbers. The longer stroke gives the combustion process more time to burn which improves economy and reduces emissions. It has such a small bore that the valves are severely shrouded which isn't an issue at low RPM but severely restricts engine efficiency as speed increases. Not only does the cam limit high RPM operation but there is a rev limiter built into later model HEI distributors to prevent high RPM use which would adversely affect emissions, fuel mileage and accelerate wear.

Invest the money you want to spend on a 4.00 stroke crank and a custom pistons and put it into building a 406 instead.
Big Dave

How many 305 blocks do you have
if you find a oem 305 block that doesnt hit water congrats
It may take 5 to 6 blocks/ tries before you do

4" stroke in an oem block is sketchy at best
How much do you really think you will gain from a 3.75 stroke in a 305???
what head you plan on using for that shit oddball bore????
You planning on a 5.7 rod?hope not with a 4" stroke_________________

How many 305 blocks do you have
if you find a oem 305 block that doesnt hit water congrats
It may take 5 to 6 blocks/ tries before you do

4" stroke in an oem block is sketchy at best
How much do you really think you will gain from a 3.75 stroke in a 305???
what head you plan on using for that shit oddball bore????
You planning on a 5.7 rod?hope not with a 4" stroke

Really??????? What the puck is wrong with a$$ holes that talk SHYt and then make phun of people like me????

A 305 with a 4" crank is really something that will go in the garbage because as Squisher said , you will hit water on every place you need to relive the block for the rods. It is really that easy to understand.

Welcome to SMOKEmUP.com. Can't figure why anyone would want to use a 305 block for anything except as dictated by a class requirement.
Follow Big Dave's advice and build up a 406.
If I were to build a new powerplant and had to start fresh I'd be leaning to the new LS platform. Huge numbers out of these puppies.

Really??????? What the puck is wrong with a$$ holes that talk SHYt and then make phun of people like me????

A 305 with a 4" crank is really something that will go in the garbage because as Squisher said , you will hit water on every place you need to relive the block for the rods. It is really that easy to understand.

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